Can't see what you're going to gain by buying anything else. You have the 10-22 and the 18-55, and the 28-135. Why do you need anything else? For landscapes, you'll be using the lenses stopped down to f/8 or lower, which will sharpen them up nicely. Use a tripod, and think about what your taking, rather than just snapping away and hoping, that'll improve your photography and not cost you money either.
BTW, lens singular does not have an "e" on the end - sorry, pet hate.
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